Water Treatment Plant Plans Vessel Changeouts to Manage PFOA Contamination

The Wausau Water Works Commission convened on August 5, 2025, to discuss critical updates regarding the water treatment process and the management of contaminants within the distribution system. The meeting focused on the timeline and strategy for replacing six vessels that are essential for maintaining water quality.

The discussion began with an inquiry into the expected timeline for changing out the vessels. It was noted that, given current staffing levels and operational preferences, the commission anticipates replacing one vessel per month. This approach aims to ensure safe sampling and mitigate risks associated with potential contamination. The commission previously encountered issues with one vessel returning unsafe results, necessitating a thorough sanitization process before it could be put back into service.

The timeline for the replacement process is projected to span approximately six months, with the first two vessels expected to be addressed within the next three to four months. The focus is particularly on vessels five and six, which are experiencing the highest levels of loading due to the contaminant of interest, PFOA (perfluoroalkyl substances). The commission is strategically grouping the vessels into three sets to manage the flow of water and ensure a steady changeover.

As the meeting progressed, members discussed the importance of preparing bid documents for the vessel replacements. A clause will be included to allow for timely notification to suppliers, ensuring that the first changeout can occur within three to four weeks after the commission reaches critical contamination levels.

In conclusion, the Wausau Water Works Commission is actively planning for the systematic replacement of water treatment vessels to enhance water safety and quality. The next steps involve finalizing bid documents and monitoring the contamination levels closely to initiate the replacement process efficiently.